Watlow Heater Catalog

Heater Selection Matrix

Heating Within a Vacuum

Typical Max. Watt Densities W/in 2 W/cm 2

Max. Operating Temperatures °F °C

Heater Type

Sheath Materials

Catalog Page

Application Description

Cartridge/ Insertion Heaters

These heaters are mounted in a vacuum vessel for radiant energy transfer.

Alloy 800 Stainless steel

up to 35 up to 35

5.4 5.4

1400 1000

760 538

9

Tubular Heaters Flexible Heaters

These heaters are mounted in a vacuum vessel for radiant energy transfer. These heaters are applied to the exterior surface of a pipe or vessel. They are well suited for curved surfaces and irregular shaped objects. Note: Polyimide is the only flexible heater type recommended for use in the vacuum. MULTICELL heaters are mounted in a vacuum vessel for radiant energy transfer. Ceramic fiber heaters surround the exterior surface of a vacuum vessel, using radiant energy for heat transfer. ULTRAMIC advanced ceramic heaters are bonded or clamped to the object being heated. Coil/cable heaters are wound into a coil or sinuated pattern and mounted in a vacuum vessel for radiant energy transfer.

Alloy 800 Alloy 600 Polyimide

30 30

4.6 4.6 1.1

1600 1800 390

870 980 200

57 57

7

111

High- Temperature Heaters

Alloy 600 Alloy 800 Molded ceramic fiber

60 60 30

9.3 9.3 4.6

2250 2250 2200

1230 1230 1205

411

419

Specialty Heaters

Aluminum nitride

1000

155

1112

600

449

Alloy 600 or Stainless steel

20

3.1

1200

650

457

Band/Barrel Heaters

These heaters are applied to exterior surface of a pipe or vessel.

Stainless steel with mineral insulation

100 15.5 1400 760 483

6